NamesIndian Remote Sensing satellite-1A
Mission typeEarth observation
COSPAR ID1988-021A Edit this at Wikidata
SATCAT no.18960
Mission duration3 years (planned)
4 years (achieved)
Spacecraft properties
ManufacturerIndian Space Research Organization
Launch mass975 kg (2,150 lb)
Dry mass895 kg (1,973 lb)
Dimensions1.56 m x 1.66 m x 1.10 m
Power600 watts
Start of mission
Launch date17 March 1988, 06:43:00 UTC
RocketVostok-2M s/n L15000-79
Launch siteBaikonur Cosmodrome, Site 31
Entered serviceJune 1988 [1]
End of mission
Deactivated1 July 1992 [1]
Orbital parameters
Reference systemGeocentric orbit[2]
RegimeSun-synchronous orbit
Perigee altitude863 km (536 mi)
Apogee altitude917 km (570 mi)
Period102.7 minutes
Linear Imaging Self-Scanning Sensor-1 (LISS-1)
Linear Imaging Self-Scanning Sensor-2 (LISS-2)
IRS-1B →

IRS-1A, Indian Remote Sensing satellite-1A, the first of the series of indigenous state-of-art remote sensing satellites, was successfully launched into a polar Sun-synchronous orbit on 17 March 1988 from the Soviet Cosmodrome at Baikonur. IRS-1A carries two sensors, LISS-1 and LISS-2, with resolutions of 72 m (236 ft) and 36 m (118 ft) respectively with a swath width of about 140 km (87 mi) during each pass over the country. Undertaken by the Indian Space Research Organisation (ISRO). It was a part-operational, part-experimental mission to develop Indian expertise in satellite imagery.


The availability of Landsat imagery created a lot of interest in the science community. The Hyderabad ground station started receiving Landsat data on a regular basis in 1978. The Landsat program with its design and potentials was certainly a great model and yardstick for the IRS programme. IRS-1A was the first remote sensing mission to provide imagery for various land-based applications, such as agriculture, forestry, geology, and hydrology.[3] The mission's long-term objective was to develop indigenous remote sensing capability.[4]

Satellite description

The satellite bus, measuring 1.56 m x 1.66 m x 1.10 metres, had the payload module attached on the top and a deployable solar panels stowed on either side. Attitude control was provided by four-momentum wheels, two magnetic torques, and a thruster system. Together, they gave an estimated accuracy of better than ± 0.10° in all three axes.[3]


IRS-1A carried two "Linear Imaging Self-Scanning Sensor", LISS-1 and LISS-2, with a spatial resolution of 72 m (236 ft) and 36 m (118 ft) respectively.[5] The three-axis-stabilised Sun-synchronous satellite carried LISS sensors which performed "push-broom" scanning in visible and near-infrared bands to acquire images of the Earth. Local equatorial crossing time (ECT) was fixed at around 10:30 of the morning.[3]


IRS-1A was launched on 17 March 1988, at 06:43:00 UTC. It had a perigee of 863 km (536 mi), an apogee of 917 km (570 mi), an inclination of 99.01°, and an orbital period of 102.7 minutes.[2]


IRS-1A was operated in a Sun-synchronous orbit. IRS-1A successfully completed its mission on 1 July 1992 after operating for 4 years.[1]

See also


  1. ^ a b c "IRS-1A". World Meteorological Organization. 28 July 2015. Archived from the original on 18 May 2023. Retrieved 12 May 2021.
  2. ^ a b "Trajectory: IRS-1A 1988-021A". NASA. 27 April 2021. Retrieved 12 May 2021. Public Domain This article incorporates text from this source, which is in the public domain.
  3. ^ a b c "Display: IRS-1A 1988-021A". NASA. 27 April 2021. Retrieved 12 May 2021. Public Domain This article incorporates text from this source, which is in the public domain.
  4. ^ "Indian Remote Sensing Satellite-1A". CEOS International Directory Network (IDN). Archived from the original on 3 March 2016. Retrieved 8 April 2013.
  5. ^ "IRS-1A (Indian Remote Sensing Satellite-1A)". ESA Earth Observation Portal. Retrieved 12 May 2021.